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United States Patent | 5,516,701 |
Hase ,   et al. | May 14, 1996 |
In an analytical method for trace amounts of silicic acid in pure water of the present invention, swollen gel which has been swollen with pure water sufficiently is used as granular solid which adsorbs colored silicic acid species. A small amount of swollen gel is aliquotted volumetrically, and then the gel is added to a sample solution. Colored silicic acid species is adsorbed and concentrated on a small amount of the granular solid. Therefore, trace amounts of silicic acid can be determined with high sensitivity.
Inventors: | Hase; Ushio (Tokyo, JP); Yoshimura; Kazuhisa (Fukuoka, JP) |
Assignee: | NEC Corporation (Tokyo, JP) |
Appl. No.: | 486231 |
Filed: | June 7, 1995 |
May 11, 1992[JP] | 4-116583 |
Current U.S. Class: | 436/164; 422/82.05; 436/100; 436/166; 436/174; 436/178 |
Intern'l Class: | G01N 021/75 |
Field of Search: | 436/100,164,166,178,52,56,73,80,81,168,174 422/82.03,82.05 |
3811837 | May., 1974 | Hoffman | 436/100. |
3920397 | Nov., 1975 | Small et al. | 436/100. |
4009004 | Feb., 1977 | Hutchinson | 436/105. |
4314823 | Feb., 1982 | Rich | 436/100. |
4544639 | Oct., 1985 | Faust | 436/104. |
5149502 | Sep., 1992 | Dablainville et al. | 422/62. |
5270216 | Dec., 1993 | Kan et al. | 436/103. |
Yoshimura et al., "Ion-Exchanger Phase Absorptiometry for Trace Analysis", Talanta, 1985, vol. 32, No. 5, pp. 345-352. Yoshimura et al., "Microdetermination of Silicic Acid in Water by Gel-Phase Colorimetry with Molybdenum Blue", Analytical Chemistry 1984, 56, pp. 2342-2345. U. Hase et al., "Determination of Silicic Acid in Highly Purified Water by Improved Gel-Phase Absorptiometry", Analytical Sciences, Feb. 1993, 9, pp. 111-115. |